Dropping PRessure on a Woucster Heatslave

I have a heatslave 9.24 I managed to find the filling loop as the pressure was always low, and filled it to 1 Bar. When the central heating is running, the pressure goes up to approx 1.2-1.3 Bar, but when the system is off, the pressure still drops to around 0.6Bar. Is this right, or is there a problem. Also still occ, the HW fails to kick the boiler on, until the central heating has been switched on, and also when the central heating has been on a while, the water is much hotter than when the HW and CH has just come on. Is this also a normal feature?? (sorry to sound a bit thick!!!) Could anyuone offer a little advice

Rgrds

Chris

pressure will rise when hot, if you fill the boiler it will drop, re-fill it to 1.5 bar then turn it back on again, it should be ok. the water needs to stablise but make sure you vent the rads

This sounds like you may have a leak in the pressure relief valve, or you may have a problem with the expansion vessel. Both of these should be checked.